Ridley Road Market
Ridley Road Market is the central marketplace in Dalston in the London Borough of Hackney. It is opposite Dalston Kingsland railway station, just off the Kingsland High Street section of the A10, about three miles north of the City of London. Traders sell a wide range of commodities, including food and clothing.

Ridley Road Market is the central marketplace in Dalston in the London Borough of Hackney. It is opposite Dalston Kingsland railway station, just off the Kingsland High Street section of the A10, about three miles north of the City of London. Traders sell a wide range of commodities, including food and clothing.
Check the official site before travelling; hours and prices can change.
More markets

Borough Market
London's defining food market — go early Saturday, eat your way around the perimeter.

Columbia Road Flower Market
Sunday-only flower market in the East End — 8 a.m. for choice, 2 p.m. for prices.

Maltby Street Market
Borough's smaller, scruffier sibling — railway arches, weekend only.
Source: wiki-list